Sara Foster showed off her growing baby bump at the Chairs For Charity auction at The Washbow in Culver City Thursday night. The event benefited the homeless youth services at the Los Angeles LGBT Center.

Sara's sister and reality TV costar Erin Foster couldn't contain her excitement at becoming an aunt for the second time (Sara and husband Tommy Haas have a daughter, Valentina). The mom-to-be wore a flowy dress, while Erin opted for a bold, body-hugging jumpsuit.

They were joined by Kevin Zegers, who recently welcomed twins of his own, Sara Rue, Andie MacDowell, and more for a great cause. LGBT youth are at far greater risk at becoming homeless as many are kicked out of their homes or struggling to find a place where they feel accepted.